#include <iostream>

using namespace std;

int main()
{
    long long a = 0;
    for (int i = 1; i <= 100; i++) a += i;
    a = a*a;
    for (int i = 1; i <= 100; i++) a -= i*i;
    cout << a << endl;
    getchar();
    return 0;
}
